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Joined: Sep 2015
Posts: 2,703 Likes: 219
SENIOR TECHNICIAN & HISTORIAN
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Hi Norm,
I usually grab a tap to check the thread 100 percent but I'm sure from memory they are 1/8 BSP.
They are the same for some old bikes as we know. $3. 61 for the thread tap.
Cheers
max.
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